Obviously, it takes two to make a baby; therefore, a man and a woman are responsible, to some extent, for each abortion (and each birth, for that matter).
However, men are solely responsible for the legality of abortion in this country. When Roe v. Wade was decided, only men were on the Supreme Court. And while legislators might be seeking the votes of women, the Supreme Court are not elected.
Do you have something to offer to dispute these facts?
How about the fact that Roe was a woman.